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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

I'm busy studying C and C++ in my spare time and have managed to write a basic XOR encryption program. I was wondering if I could give the output of a single word that has been encrypted and ask someone to crack it and return to me the original input word (along with an explanation of how it was acheived). And before anyone laughs at me for this, I am trying to learn here.
Thanks in advance,
Craig.

iirc , basic XOR means replacing 0 with 1 and vice versa ie 1011 => 0100.
To unencrypt, apply the same rule to the result above...
This is a symmetric encryption/decryption method.
For a good explanation of symmetric and asymmetric encryption, see the manual here: http://www.gnupg.org/
Also has code for you to use.